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피질골 골결손부에서 Oxidized Cellulose 피개의 영향에 관한 실험적 연구
김회종,임재석,Kim, Hoi-Jong,Rim, Jae-Suk 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.2
In dentistry, bony defects can be formed by cyst, tumor, inflammation, trauma and surgery in maxilla and mandible. If the overlying soft tissue invades and preoccupies the jaw bony defects, regenerated bony tissue same as adjacent bone can not replace whole space of the defects, thus preventing osteogenesis from occurring. Guided bone regeneration(GBR) is based on the prevention of overlying soft tissue from entering the bony defect during the initial healing periods. E-polytetrafluoroethylene(e-PTFE) is one of an effective and widely used barrier membrane for GBR, but it has the disadvantages such as surgical removal and high price. To overcome such disadvantages of e-PTFE, many investigators have proposed various absorbable barrier membranes. Inexpensive oxidized cellulose($Surgicel^{(R)}$) membrane was shown to have potential for use as an absorbable barrier membrane for regenerative procedure and it would not require surgical removal. The purpose of this study is to investigate the absorption periods of oxidized cellulose at the implant site and usefulness as a mechanical barrier, preventing the ingrowth of the overlying soft tissue into the bony defects. Two bony defects were made in each tibia of a dog using drill and one defect covered with oxidized cellulose and the other covered with periosteum directly as control. The experimental animals were sacrificed at 1st-7th, 10th, 14th, 21th, 28th day postoperatively, Inspection of the specimens was done to evaluate gross changes. Specimens were examined histopathologically by hematoxylin-eosin and Masson's trichrome staining under light microscope. The results were as follows : 1. There was no significant differences of inflammatory reaction between the experimental and the control group. 2. The resorption of oxidized cellulose was almost completed within 14th day. 3. Histologically, bone formation in the experimental group was somewhat more than that of the control group at 10th, 14th, 21th and 28th day postoperatively. The bone forming pattern of the experimental group was more regular than that of the control group. 4. There was no evidence of soft tissue invasion into the bony defect in the experimental group. In conclusion, oxidized cellulose membrane might be used as an alternative absorbable barrier membrane to prevent overlying soft tissue invasion into the bony defects.
코르게이트 도파관을 사용한 위성통신용 저역통과 여파기의 설계
김회종,최학근 한국인터넷방송통신학회 2013 한국인터넷방송통신학회 논문지 Vol.13 No.2
본 논문에서는 코르게이트 도파관을 사용한 위성통신용 저역통과 여파기를 제안하였다. 본 구조는 위성통신용 시스템으로 사용되기 위해 임피던스 트랜스포머와 T-junction을 배열한 코르게이트 도파관이 결합된 형태로 설계하였다. T-junction은 낮은 삽입손실과 높은 격리도의 특성을 만족시키기 위해 Chebyshev 함수를 사용하여 설계하였다. 임피던스 트랜스포머는 높은 반사손실을 위해 코르게이트 도파관의 양 끝에 높이가 다른 T-junction을 결합한 구조로 설계하였다. 제작된 여파기는 12.25 ~ 12.75 GHz에서는 반사손실이 35.4 dB이상, 삽입손실은 0.1 dB이하, 14.0 ~ 14.5 GHz에서는 격리도가 54.4 dB이상으로 나타났다. 따라서 본 논문에서 제안된 저역통과 여파기는 위성통신용 시스템에 사용 가능함을 보였다. In this paper, low pass filters(LPF) using corrugated waveguide for satellite communication is proposed. To design the proposed LPF, the corrugated waveguide and impedance transformers are combined. The corrugated waveguide is formed by arrangement of T-junction. To obtain low insertion loss and high isolation propriety, T-junction is designed by using Chebyshev function. Impedance transformers is designed by combining T-junction with different heights at both ends of the corrugated waveguide to get high return loss. The measured results of the proposed LPF have a return loss of over 35.4 dB, a insertion loss of less than 0.1 dB from 12.25 GHz to 12.75 GHz and a isolation propriety of over 54.5 dB from 14 GHz to 14.5 GHz. From these results, it is confirmed that the proposed waveguide LPF can be used for satellite communication.
본원 치과에 내원한 치성낭종(Odontogenic Cyst)환자에 대한 임상적 고찰
조민,이상은,류재준,김성문,임재석,김회종 大韓顎顔面成形再建外科學會 1990 Maxillofacial Plastic Reconstructive Surgery Vol.12 No.2
Odontogenic cyst has been reviewed with a report on the 193 cases clinico-statistically. We found that cysts occur frequently at third decade male as 29% and second decade female as 30%. Maxilla is prevalent site as 74.6% than mandible. Uper incisiors and lower third molars are the most prebalant teeth. Swelling is the most frequent chief complaint. After enucleating, we grafted to the cystic cavities in 10 cases.
1.48 ㎛ 레이저 다이오드로 여기된 Er³+ 첨가 광섬유 광증폭기에 대한 이론적 분석
김회종(Hwe Jong Kim),이상배(Sang Bae Lee),조재철(Jae Cheol Jo),최상삼(Sang Sam Choi),김영덕(Yong Duk Kim) 한국광학회 1993 한국광학회지 Vol.4 No.1
3준위 레이저 rate equation 및 overlap integral로부터 파장 1.48 ㎛에서 여기된 Er³+ 첨가 광섬유 광증폭기를 위한 광섬유 매개 변수의 최적 조건을 계산하였다. 이 계산으로부터 Er³+ 첨가 광섬유 광증폭기의 소신호 이득(small signal gain) 특성을 개구수 (N.A.), V값, 광섬유 길이, 차단 파장(cutoff wavelength) 등의 함수로 알아 보았으며 또한, 최대 소신호 이득을 갖기 위한 광섬유 매개 변수를 결정하였다. We carried out the useful theoretical calculation for the optimum design of a 1.48 ㎛ diode laser pumped Er³+ doped fiber amplifier. The model we established is based on the rate equations of three level laser system and the overlap integral between fundamental mode LP_(01) and Er³+ doped area.<br/> We determined several fiber parameters (N.A., V value, fiber length, Er³+ concentration, cutoff wavelength etc.) for the optimum design of a high optical gain. We found that our theoretical results are very useful to the design of Er³+ doped fiber used in EDFA.
압박고나사를 이용한 대퇴골 전저간골절의 치료 -고정소싱의 원인적 요소에 대한 임상적 분석-
김회종 ( Hee Joong Kim ),김영민 ( Young Min Kim ),이상훈 ( Sang Hoon Lee ),이지호 ( Ji Ho Lee ),강승백 ( Seung Baik Kang ) 대한외상학회 1991 大韓外傷學會誌 Vol.4 No.2
Among the many devices available for internal fixation of intertrochanteric fractures of the femur, the compression hip screw (CHS) has gained considerable acceptance. But some reports indicated that the loss of fixation was not infrequent in cases using the compression hip screw. A clinical analysis of causative factors in loss of fixation was performed. Of ninety four intertrochanteric fracture patients treated with CHS from 1985 to 1990, forty four patients (14 males and 30 females) were reviewed, whose follow-up period was more than three months. The average age at surgery was 72 years (range, 25 years to 92 years). As the index of loss of fixation, sliding of lag screw, migration toward acetabulum (including penetration), varus tilting of proximal fragment, metal failure and separation of plate from femur shaft were considered. Osteoporosis, fracture stability, initial reduction state and location of lag screw in head were considered as causative factors. Of 44 cases, sliding (max. 5.6 pitch, average 1.41 pitch) in 33 cases, migration toward acetabulum (max. 4.3 pitch, average 0.23 pitch) in 12 cases and varus tilting in 4 cases were noted. Neither metal failure nor separation case was observed. In causative factors, osteoporosis, fracture stability and Dimon-Hughston tendency reduction and nonanatomic reduction at initial reduction were significant factors in loss of fixation. Placement of lag screw more than 1cm from subchondral bone is considered to be safe. Using a short barrel plate is recommended for the cases in which large amount of sliding is expected.
Radio Frequency Plasma Power변화에 따른 ITO 특성 및 OLED의 광학적 특성
기현철,김회종,홍경진,김은미,구할본,Ki, Hyun-Chul,Kim, Hwe-Jong,Hong, Kyung-Jin,Kim, En-Mei,Gu, Hal-Bon 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.1
We has been analysed optical properties of OLED(organic light emitting diode) and characteristics of ITO(Indium Tin Oxide) in terms of $O_2$ plasma treatment for manufacturing high efficiency OLED, RF power of $O_2$ plasma was changed 25, 50, 100, 200 W. $O_2$ gas flow, gas pressure and treatment time were fixed. Sheet resistance and surface roughness of ITO were measured by Hall-effect measurement system and AFM, respectively. The ranges of sheet resistance and surface roughness were $5.5{\sim}6,06\;{\Omega}$ and $2.438{\sim}3.506\;nm$ changing of RF power, respectively, PM(Passive Matrix)OLED was fabricated with the structure of ITO(plasm treatment)/TPD($400\;{\AA}$)/$Alq_3(600\;{\AA})$/LiF($5\;{\AA}$)/Al($1200\;{\AA}$). Turn-on voltage of PMOLED was 7 V and luminance was $7,371\;cd/m^2$ at the RF power of 25 W, $O_2$ plasma treatment of ITO surface was result in lowering the operating voltage and improving luminance of PMOLED.
Reactive Ion Etching에 의한 ITO/반도체 및 ITO/BaTiO3 구조의 선택적 에칭 특성
한일기,이윤희,김회종,이석,오명환,이정일,김선호,강광남,박홍이,Han, Il-Ki,Lee, Yun-Hi,Kim, Hwe-Jong,Lee, Seok,Oh, Myung-Hwan,Lee, Jung-Il,Kim, Sun-Ho,Kang, Kwang-Nham,Park, Hong-Lee 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.1
Eteching characteristics of the Indium Tin Oxide (ITO), which is transparent conductor, was investigated with CH4/H2 and Ar as etching gases for the Reactive Ion Etching (RIE). With CH4/H2 for the etching gas, the highly selective etching characteristics for the ITO on GaAs was obtained. It was examined that the dominant etching parameter for the selective etchning of ITO on GaAs structure was the chamber pressure. But, the etching selectivity for ITO on InP was poor eventhough we tried systematic etching. RIE etching conditins using CH4/H2 gas was limited due to the formation of polymer on the substrates. In the case of Ar gas for the reactive gas, the selectivity of ITO on BaTiO3 was above 10. The etch rete of ITO was more sensitive to the etching parameters than that of BaTiO3, which was almost constant with different etching parameters.